Six Sigma DMAIC Process - Control Phase - SPC - Out of Control

A process is said to be out of control if:
  • One or more data points fall outside the control limits
  • Seven consecutive data points increasing or decreasing
  • Eight consecutive data points are on one side of average
  • Fourteen consecutive data points alternating up & down
  • Two data points, out of three consecutive data points, are on the same side of the average in zone A or beyond
  • Four data points, out of five consecutive data points, are on the same side of the average in zone B or beyond
  • Fifteen consecutive data points are within zone C (above and below the average)

Six Sigma Out of Control Charts-1



Six Sigma Out of Control Charts-2




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